harness: composer textEntry grows horizontally and squeezes ▶/■ off-canvas before wrapping

[btipling]

Summary

The composer text field grows sideways. Long input (no newlines) expands the textEntry in the horizontal chrome box and pushes ▶ Send / ■ Stop off the canvas before the field wraps and grows up.

#702 / #709 fixed caret h-scroll (scroll_horizontal = false so break_lines can fire). This is a different miss: the widget min-size width still tracks the unwrapped line, so the parent row gives the field the long line and the icons get leftover 0.

docs/harness-limits.md Wrap / grow: wrap at field width, grow vertically to COMPOSER_MAX_CHROME_H (124 px), then scroll inside. Icons stay on-canvas (TOUCH_H squares, gravity_y = 1.0). Never a horizontal gutter. Repo no-h-scroll (#344 / #457 / #579).

Observed

1. Focus the canvas composer (Message the model…).
2. Type or paste a long single line — longer than the field, no Enter.
3. Watch the ▶ (and Busy ■) on the same row.

Actual: the input box widens. The trailing icon(s) slide off the right edge / get crushed before the chrome grows up. Hard to send; Busy Stop can leave the viewport.

Expected: field width is the leftover of the chrome row after the icon pack. Long text wraps at that width. Chrome grows up (idle ~44 px → cap 124 px). Past the cap, the entry scrolls vertically inside. ▶/■ stay fully on-canvas at TOUCH_H for every frame of that growth.

Likely seam

Horizontal composer box (native/harness/src/ui.zig ~595): textEntry (expand = .horizontal, min_size_content.w = 120, max_size_content.w = max_float_safe) then fixed TOUCH_H icon buttons.

Piece	Role
dvui.box .dir = .horizontal	Field + icons share one row
textEntry scroll_horizontal = false	Inner scroll .none → wrap at current viewport.w (#709)
max_size_content.w = max_float_safe	TextEntryWidget.init strips it; not a width cap vs the icons
min_size_content.w = 120	Floor only. If deinit reports unwrapped line width as min-size.w, the box allocates that first
Icon min_size_content TOUCH_H×TOUCH_H	No gravity_x / reserved trailing slot; leftover after the field

scroll_horizontal = false can wrap glyphs inside a field that has already stolen the icon columns.

Goal

• Composer field never grows past chrome.w − icon_pack.w − margin.
• Icons stay on-canvas (idle one ▶; Busy ▶ + ■).
• Long lines wrap, then grow up, then scroll inside. No horizontal gutter.

Non-goals

• Reverting scroll_horizontal = false (that was the harness: composer text field horizontally scrolls instead of wrapping and growing #702 caret pan).
• Dual DOM input.
• Changing COMPOSER_MAX_CHROME_H / TOUCH_H.
• Queue-row editor (single-line, multiline = false).

Related

• native/harness/src/ui.zig — composer chrome box + textEntry InitOptions + icon buttons
• docs/harness-limits.md — Wrap / grow, Icon button
• Closed wrap of caret pan: #702 / #709

Suggested next: type a long line with no spaces; the ▶ must stay fully visible while the field wraps and the chrome grows up.

[btipling]

Closed: shipped in PR #744 (merge SHA ff9a1e8).